Backwater valve for drains



Feb. 19, 1952 FIG. l

' E. G. sToLTz, SR

BACKWATER VALVE FOR DRAINS Filed Oct. 51. 1949 y |I I/ 23/\ 9 I 5 t i l I /22 1 II |31 III la I3 y I I MII, 1

II 9 \II INVENTOR EDMUND BY M.

ATTORNEY G.- STOLTZJ SR.

Patented Feb. 19, 1952 UNITED STATES PATENT OFFICE BACKWATER VALVE FOR DRAINS Edmund G. Stoltz, Sr., Granite City, Ill.

Application October 31, 1949, Serial No. 124,673

2 Claims.

This invention relates to a valve for drains, such as a floor drain, and is adapted to be used to prevent back water or flood water in a sewer pipe or drain pipe from backing up and flooding the area served by the drain.

While the invention is defined in the appended claims, a summary statement will assist in understanding the claims and the following detailed description of a preferred embodiment of the invention. Since, however, a part of the invention may be used without the whole, this summary is not to be construed as limiting the invention beyond that defined in the claims.

The valve includes a tubular supporting member adapted to be inserted in and communicating at its bottom with a drain pipe. A boss is fixedl centrally within said tubular member by a webbing or ribs integral with and connecting the boss and the tubular member. A plate is adapted to engage a seat at the top of the tubular member and thereby close the member. A stud, fixed to the plate and extending downwardly therefrom,`

is threaded in the boss, whereby the tubular member may be opened and closed by turning the plate. A removable annular strainer may be supported between the boss and the tubular mem bers by resting upon the webbing or ribs.

In order to protect the threads of the boss and the stud from dirt and to provide a retainer for lubricant, a housing is provided which includes a tubular wall or cup extending upwardly from the boss and a tubular sleeve extending downwardly from the plate in telescopic engagement with the said tubular wall or cup.

The invention may be better understood from the following detailed description of a preferred embodiment taken with the accompanying draw ings.

Fig. 1 is a vertical section through the valve with the valve in closed position; and

Fig. 2 is a vertical section showing the valve installed in a drain with the valve in open position.

The valve is adapted to be installed in the bell or flanged upper end portion of a customary sewer pipe or drain pipe 5. It includes a tubular or cylindrical supporting member 6 which, as specifically shown, may be installed with its lower end resting upon a shoulder 'I of the drain pipe. The tubular member 6 is surrounded by packing material 8, between the outer surface of the cylindrical member and the inner surface of the sewer pipe 5. This packing material may be of concrete, as shown, or may be of any convenient packing or caulking material which is such as will provide a water tight flt and hold the valve in position.

A boss 9 is fixed centrally within the tubular' member 6 and is supported by ribs II, which eX- tend between the outer surface of the boss 9 and the inner surface of the tubular member B.

The connection between the boss and the tubular member may be any type of webbing but a minimum of ribs is preferable, since this leaves suicient space to insert a clean-out cable if desired. To provide a strainer, an annular plate I 2 having holes I3,'rests upon the ribs II and loosely fits within the tubular member and about the boss.

A closure plate I4 is adapted to engage a seat at the top of the tubular member 6. As specically shown, the top surface I5 of the tubular member 6 is finished in a plane flange to form` the seat. An annular ring I6 extends downwardly from the plate I 4 and has a circumferential groove I'I to hold the inner edge of a gasket I8, carried on the bottom of the plate I4 and adapted to form a seal with the top surface or seat I5 on the tubular member 6.

A stud I9 is integral with and extends downwardly from the plate I4 and has threads 2| on its lower end adapted to engage internal threads in the boss 9. Thus, it will be seen that, by turning the plate, it will be caused to open and close against the seat I5. In order to protect the threads of the stud and the boss against dirt and to form a lubricant retainer, a housing is provided for the stud. This housing includes a tubular cylindrical member or cup 22 integral with the boss and extending upwardly therefrom, and a cylindrical sleeve 23 extending downwardly from and integral with the plate I4 and in telescopic engagement with the cup 22.

The valve assembly, therefore, really includes three integral members: the tubular supporting member with its appurtenances; a closure plate I4 with its appurtenances; and the annular strainer I2.

The tubular member has preferably, at its top and bottom, annular flanges 24 and 25, respectively. This tubular member B, with its flanges 24 and 25, the webbing or ribs I I, the boss 9 and cylindrical cup 22, may be cast integrally and later, of course, subjected to necessary machining.

In order to provide convenient means for turning the plate I4 a central nut or lug 26 is provided on the top of the plate, as well as a wing lug 21. The plate member I4, with its appurtenances, nut or lug 26, wing lug 21, stud I9 and sleeve 23, may be cast integrally.

The operation of the device may be obvious from the foregoing description. The valve may be placed and secured within the bell end of a customary sewer drain pipe. As speciiically shown, the top of the valve is substantially level with the floor to be drained. It may, however, be set in a drain pipe so that the top of the assembly is below the level of the iloor, in which case a strainer plate may be placed over the entire structure.: Its'- mode lof connection with the drain pipe maybe varied;'

For ordinary use, the valve Will remain open as shown in Fig. 2 and may be closed upon threatened flood conditions so as `to stop'the flow of any back water. The ribs Il, as when three are employed, leave substantial spaces be-i tween them for the entrancev of a cabletool for cleaning out the drain pipe. These ribs provide a rest for the annular strainer plate I2, which is loose tting so that it may be easily removed.

While :there-,has beenshownasquare nut or lug 26 and a Wing-lug 21 by which the plate vmay berotated',`. it i. will 1 be i` abviousiftiimY other. convenient 'means may 'be employed which i will givea'fconnection' .with a: wrenchzor Aother .tool .tolturn1 1. A back waterrvalveforidrains, comprising` a' tubular.` suppportingfmember adaptedv .to com- I municate atits bottomfvwith'adram pipe,vaiboss xed centrally Within said tubular member, a plate adapted to engage a seat at the top of the tubular member and thereby close said member, a stud ilxed to said plate and threaded in the boss, whereby the tubular member may be opened and closed by turning the plate, and a housing for the stud including a tubular wall extending upwardly from the boss and a tubular sleeve extending downwardly from the plate in telescopic engagement with'said tubular wall.

2. A backwater valve'for drains, comprising a tubular supporting member adapted to communicate at its bottom with a drain pipe, a boss xed. centrallyl within said tubular member, a plate adapted to engage a seat at the top of the tubular member and thereby close said member, a studxed to said plate and threaded in the boss, whereby the tubular member may be opened and closed by turning the plate, a cylindrical cup integral with .and extending upwardly fromthe .boss .to form the bottom of alubricant retainer, and: a cylindrical .sleeve extending downwardly from the plateabout the stud andA in telescopic engagement therewith.

EDMUND G. STOLTZ, SR.

REFERENCES. CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 142,438 Chapman Sept. 2, 1873 1,190,841 Almasy et al July 11, 1916 1,211,283 Butler Jan. 2, 1917 1,674,074 Turner June 19, 1928l 1,875,857 Cruff et al Sept. 6, 1932 2,174,332 Schweighart, Sept. 26, 1939. 

